Okay, I have a problem, maybe someone can help me with. I have a 2000 Olds Silhouette and the A/C unit is doing something strange. The rear blowers and the passenger side blowers are blowing colder air than the driver side vents. The driver side vents are blowing warm air when the temp control is all the way to cold. Any suggestions?

I have a 2002 Silhouette service manual and it suggests that the A/C system may be undercharged.